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TL;DR
Flan-UL2 is an encoder decoder model based on the
T5
architecture. It uses the same configuration as the
UL2 model
released earlier last year. It was fine tuned using the "Flan" prompt tuning
and dataset collection.
According ot the original
blog
here are the notable improvements:
The original UL2 model was only trained with receptive field of 512, which made it non-ideal for N-shot prompting where N is large.
The Flan-UL2 checkpoint uses a receptive field of 2048 which makes it more usable for few-shot in-context learning.
The original UL2 model also had mode switch tokens that was rather mandatory to get good performance. However, they were a little cumbersome as this requires often some changes during inference or finetuning. In this update/change, we continue training UL2 20B for an additional 100k steps (with small batch) to forget “mode tokens” before applying Flan instruction tuning. This Flan-UL2 checkpoint does not require mode tokens anymore.
Important
: For more details, please see sections 5.2.1 and 5.2.2 of the
paper
.
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